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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $81,694 | $268,003 | $1,472,752 | $231,333 | $213,128 | $221,527 | $244,477 |
| Electrical insulators, of ceramics | $2,296,035 | $1,938,588 | $4,177,598 | $3,796,408 | $6,158,988 | $5,571,348 | $8,001,302 |
| Electrical insulators of any mat. other than glass & ceramics | $5,982,525 | $5,152,463 | $2,576,013 | $3,253,983 | $5,550,109 | $5,506,953 | $7,288,025 |
| Total | $8,360,254 | $7,359,054 | $8,226,363 | $7,281,724 | $11,922,225 | $11,299,828 | $15,533,804 |
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